III. Consistency

UI and Markup Consistency

Most people preach consistency when creating style guides, that consistency is good for user experience, but what do they know?

Form elements switch between flat UI and skeuomorphic UI

There are three different colors for primary, success, info, warning, and danger states (not including disabled states)

Navigation marked up with <ul>/<li> are sometimes marked up with role="presentation", sometimes not

IV. Performance

Bootstrap Core File Size

While Pew Internet claims that about 20% of all Americans mostly use their mobile phone for going online, performance really isn't a design constraint for Bootstrap Core, so it doesn't need to be for you!

97 KB of minified core CSS

16 KB of .woff fonts

28 KB of minified JS (before jQuery)

That's 141 KB of assets before any of your content or any of your site-specific theming, which on average 3G download speeds would take about 560ms to download